Laravel Mutator to add predefined values into database

I'm new into Laravel and I'm trying to store the user's company id on a column of the products table each time a user creates a new product. The company's id it's retrieved from the user's session. I'm trying it with Laravel's Mutator:

public function setFirstNameAttribute($value) {
        $this->attributes['company_id'] = session()->get('company.id');
    }

But each time I create a new Product the company id stored it's null. Seems like the function it's never executing. Is there any other resource to perform actions like this?



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